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Vanaja M Sonar

@vanajamsonar

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Seasoned C/C++ payments engineer specializing in POS, EMV, ISO8583 systems.

India

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What I'm looking for

I want a senior C/C++ payments engineering role in a high-performance FinTech team, focusing on POS/EMV/ISO8583 systems, hands-on development, production stability, and technical leadership.

I am a results-driven software engineer with 12+ years' experience designing, developing, testing, and deploying mission-critical payment solutions across POS terminals, switching applications, and banking/FinTech clients. I have built core payment modules, EMV libraries, ISO8583 message processing, socket communications and automation scripts that improved transaction speed, stability and routing reliability.

I have led teams as Tech Lead and Technical Manager, delivered major feature enhancements for global clients, resolved critical production issues with high SLA compliance, and mentored junior engineers to accelerate delivery. I seek a challenging C/C++/Payments engineering role in a high-performance FinTech environment where I can drive secure, scalable payment solutions.

Experience

Work history, roles, and key accomplishments

Tech Lead

Encora Ltd

Dec 2018 - Dec 2022 (4 years)

Engineered core POS payment modules for Telium/Tetra terminals, improving transaction speed and stability by 30% and reducing field deployment time via remote/auto-download by 40%. Led production support achieving 95%+ SLA compliance and reduced defects for major clients by 25%.

C++Socket Programming Python Shell Scripting Debugging

Technical Manager

QuessCorp

May 2021 - Aug 2021 (3 months)

Managed technical delivery and operations for payments projects, coordinating cross-functional teams during May–Aug 2021 to ensure continuity and meet client SLAs.

Team Leadership Stakeholder Management Payments Operations Debugging SQL

Mandates Manager

Attra Infotech

Apr 2015 - Sep 2018 (3 years 5 months)

Supported 40+ global banks on L2/L3 mandates and ISO8583 processing, improving transaction routing reliability by 35% and maintaining 100% uptime during peak periods through rapid production issue resolution.

ISO 8583 Tuxedo ElectraSwitch Troubleshooting Mentoring

Tech Lead

Wipro Technologies

Mar 2008 - Jan 2015 (6 years 10 months)

Led development and testing for embedded and driver automation projects (including Intel Android graphics), delivering Python/Shell automation that cut manual testing by 50% and improving system stability through memory and leak analysis.